Moses killed an Egyptian, so he had to flee to Midian.

Acts 7:23-29

23 “One day when Moses was about 40 years old, he decided that he would go and see his fellow Israelis. So he went to the place where they worked. 24 He saw an Egyptian beating one of the Israelis. So he went over to help [MTY] the Israeli man who was being hurt/beat {whom the Egyptian was hurting/beating}, and he ◄got revenge on/paid back► the Israeli man by killing the Egyptian who was hurting/beating him. 25 Moses was thinking that his fellow Israelis would understand that God had sent him to free them from being slaves. But they did not understand that. 26 The next day, Moses saw two Israeli men fighting each other. He tried to make them stop fighting by saying to them, ‘Men, you two are fellow Israelis! So ◄stop hurting each other!/why are you hurting each other?► [RHQ]’ 27 But the man who was injuring the other man pushed Moses away and said to him, ‘◄No one appointed you (sg) to rule and judge us (exc)!/Do you (sg) think someone appointed you (sg) to rule and judge us (exc)?► [RHQ] 28 Do you want to kill me as you killed the Egyptian yesterday?’ 29 When Moses heard that, he thought to himself, ‘Obviously, people know what I have done, and someone will kill me.’ He was afraid, so he fled from Egypt to Midian land. He lived there for some years. He got married, and he and his wife had two sons.”